Take up the mantle, read the fates, control them, use them. You are The Fortuneteller. You are to be the best of the best. Use the tools given to take what is rightfully yours, vengeance.
People will give everything to know their fate. Give it to them for a price!
Make money, buy mystical artefacts, and use them to see deeper on the other side of the veil. Manage your resources. You have a limited time, and a limited amount of power to use your fortune-telling in a day.
You will have tools like:
Ouija Board. Read the messages from the other side. Interpret them, to your will.
Crystall Ball. Read the stars, align them to see the truth.
Tarot cards. Interpret the three cards. Each of them holds a key.
Magic Crystals. Try to see the future and how it will affect the present.
Using all of these tools, solve the crime of who killed your sister, and take justice into your own hands.